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110 lines
6.2 KiB
HTML
110 lines
6.2 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Returns the number of fields contained in a result set</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.db2-num-fields" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">db2_num_fields</h1>
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<p class="verinfo">(PECL ibm_db2 >= 1.0.0)</p><p class="refpurpose"><span class="refname">db2_num_fields</span> — <span class="dc-title">
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Returns the number of fields contained in a result set
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</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.db2-num-fields-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>db2_num_fields</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$stmt</code></span>
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) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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Returns the number of fields contained in a result set. This is most useful
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for handling the result sets returned by dynamically generated queries, or
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for result sets returned by stored procedures, where your application cannot
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otherwise know how to retrieve and use the results.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.db2-num-fields-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">stmt</code></dt>
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<dd>
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<p class="para">
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A valid statement resource containing a result set.
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.db2-num-fields-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns an integer value representing the number of fields in the result
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set associated with the specified statement resource. Returns <strong><code>FALSE</code></strong> if
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the statement resource is not a valid input value.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.db2-num-fields-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-1266">
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<p><strong>Example #1 Retrieving the number of fields in a result set</strong></p>
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<div class="example-contents"><p>
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The following example demonstrates how to retrieve the number of fields
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returned in a result set.
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</p></div>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /><br />$sql </span><span style="color: #007700">= </span><span style="color: #DD0000">"SELECT id, name, breed, weight FROM animals ORDER BY breed"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$stmt </span><span style="color: #007700">= </span><span style="color: #0000BB">db2_prepare</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn</span><span style="color: #007700">, </span><span style="color: #0000BB">$sql</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">db2_execute</span><span style="color: #007700">(</span><span style="color: #0000BB">$stmt</span><span style="color: #007700">, </span><span style="color: #0000BB">$sql</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$columns </span><span style="color: #007700">= </span><span style="color: #0000BB">db2_num_fields</span><span style="color: #007700">(</span><span style="color: #0000BB">$stmt</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #DD0000">"There are </span><span style="color: #007700">{</span><span style="color: #0000BB">$columns</span><span style="color: #007700">}</span><span style="color: #DD0000"> columns in the result set."</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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There are 4 columns in the result set.
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.db2-num-fields-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="db2_execute.html" class="function" rel="rdfs-seeAlso">db2_execute()</a> - Executes a prepared SQL statement</span></li>
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<li class="member"><span class="function"><a href="db2_field_display_size.html" class="function" rel="rdfs-seeAlso">db2_field_display_size()</a> - Returns the maximum number of bytes required to display a column</span></li>
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<li class="member"><span class="function"><a href="db2_field_name.html" class="function" rel="rdfs-seeAlso">db2_field_name()</a> - Returns the name of the column in the result set</span></li>
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<li class="member"><span class="function"><a href="db2_field_num.html" class="function" rel="rdfs-seeAlso">db2_field_num()</a> - Returns the position of the named column in a result set</span></li>
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<li class="member"><span class="function"><a href="db2_field_precision.html" class="function" rel="rdfs-seeAlso">db2_field_precision()</a> - Returns the precision of the indicated column in a result set</span></li>
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<li class="member"><span class="function"><a href="db2_field_scale.html" class="function" rel="rdfs-seeAlso">db2_field_scale()</a> - Returns the scale of the indicated column in a result set</span></li>
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<li class="member"><span class="function"><a href="db2_field_type.html" class="function" rel="rdfs-seeAlso">db2_field_type()</a> - Returns the data type of the indicated column in a result set</span></li>
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<li class="member"><span class="function"><a href="db2_field_width.html" class="function" rel="rdfs-seeAlso">db2_field_width()</a> - Returns the width of the current value of the indicated column in a result set</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |